Combination power and jack



,yam )1, E924 EA'Z'OJMB G. A. STAFFORD COMBINATION POWER AND JACK med April 14. 1921 2 sheets-sheet 1 l [Q Qr w O M m Jan. l R924 LWQJMIB G. A. STAFFORD COMBINATION POWER AND JAGN Fild April 14 1921 Sheets-Sheet 2 Patented qTan. 1, 19234.

Unir

tatiana GEORGE A. STAFFORD, vO1? SCUBA LAKE, TEXAS.

COMBINATION POWER AND JACK.

Application filed April 14, 1921.

To all whom t 'may conce/m.'

Be it known that T, GEORGE A. STAFFORD,

a citizen of the United States, residing at Sour Lake, in the county of Hardin and State of Texas, have invented certain new and useful Improvements in a Combination Power and Jack, of which the following' is a specification.

This invention relates to new and useful improvements in a combination power and ack. J One object of the invention is to provide a device of the character described specially adapted for use in pumping wells and may be connected to a number of wells and will operate them all at the same time.

Another object is to provide a pump jack, and operating means therefor, whereby the jack may be operated much faster than is the case with similar apparatus now in use, and without any appreciable increase in power.

Another feature resides in an improved form of jack by means of which the leverage is automatically varied as the load varies, greater leverage being available when the load is heavy than when it is light.

A further feature resides in the provision of a jack the length of whose stroke may be 30 readily varied.

With the above and other objects in view this invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein Figure 1 is a plan view of the device.

Figure 2 is a side view, and

Figure 3 is a transverse sectional view of an eccentric employed.

Referring now more particularly to the drawings, the numeral 1 refers to the derrick ioor, the numeral 2 is the well casing and the numeral 3 designates the outlet pipe leading from the well. Fixed to the derrick floor at one side, there is a standard 4, to the top of which the walking beam 5 is pivoted at one end. Attached to the other end of this beam there is a rod clamp 6 provided for attachment to the pump rod 7.

A V-bar is pivoted to the derrick floor and is formed with the arms 8 and 10 and interposed between the free end of the arm 8 and the free end of the walking beam there is Serial No. 461,399.

the lift bar 9 which is pivotally connected to said arm and beam.

The arm 10 is slotted and its front side has a plurality of transversely aligned bearings 11. The. construction above described constitutes the pump jack and connecting parts. The power for operating said jack will now be described.

The numeral 12 designates a stand provided with vertically aligned bearings wherein .the shaft 13 rotates. The upper end of this shaft carries a power wheel 14 which is driven by the belt 15. Fixed on the shaft 13 are the oppositely disposed eccentrics 16, 16 surrounding which there are the eccentric yokes 17, 17.

Located between the stand 12 and the ack there is a suitable framework v18, in which the vertical shaft 19 rotates, and fastened to the upper end of thisshaft there is a segmental rack 20 which is in mesh with the spur gear 21. This gear is fixed to the vertical shaft 31 and the upper end of this shaft carries a power disc 22. An actuating bar 23 works in suitable bearings carried by the standard 4 and also works through the slot of the arm 10 and its end adjacent said arm is formed with a bearing head 24 which carries bearing lugs 25 disposed to work in the opposing bearings l1. The bar 23is connected to the disc 22 through the jack line 26 which is connected to the bar by a hook and clevis, as shown. This jack line is usually of considerable length and pivoted eccentrically to said disc. The segmen tal rack 2O has opposing upturned lugs 27, 27 spaced apart forming bearings for the ends of the adjusting shaft 28. This shaft has reversely threaded sections to receive the nuts 29, 29. The yokes 17 are connected to the nuts 29 through the jack lines 30.

Tn operation the power wheel 14 is driven bythe belt 15 and this operates, through the mechanism described, to oscillate the rack member 2O and rotate the gear 21, and the shaft 31 carrying said gear, back and forth, and through them to also rotate the disc 22 back and forth. The actuating bar 23 is thereby alternately pulled and released through the jack line 26 and the V-bar oscillated back and forth and the walking beam oscillated up and down. On power stroke the pump rod is elevated and when released moves down by gravity.

In practice a number of wells located on fifa ldiferent sides of the power and often ifi several hundred yards from it, are connectedy to, andI operated by the. power, and they are arranged to balance each other, that is while some are on up stroke and others are on down stroke. This results in a unilorm and steady movement oi the power and prevents a sudden down stroke or any of the pumps.

By turning the rod 28 in one direction the nuts 29 may be runl towardv each( other and the stroke lengthened: and in a reverse manner the s'trolre'inay be shortened- The stroke may be also adjustedA by eiliusting the connection of the jack line 26 to the disc 22;

The bearings ll andl 25 have been arranged as shown in Figure l1 for the sake of economy in power. At the beginning of the up stroke, where. greatest power is required?, the upper bearing` of:` the arm l is lirst brought into-play, as shown in dottedlines in Figure 2, thus giving the longest leverage at the time the power disc 22 is furthest ofi' center. its the arm l() moves backwardly the lowcr bearings ll and 25 come into play successively7 the leverage thus being;` shortened as the power disc approaches center.

The gearing is such. that there are two pumpy strokes for` each revolution oi the power eccentrics, andi the capacity of the jack is thereby relatively increased,rcsult ing in an economy of power.

VVha-t I claim is l. A device of the character described, includinga power wheeh a pair ofoppositely disposed eccentrics connected* to, and operatedfthereby, a puin-p jack, and a mechanism through which said eccentrics are connected to said jack to operate the same, said mechanism including gearing' which imparts two strokes to; the jack for each revolution of the power wheel.

2. Av device of the character described,

including a power wheel, a shaft on which said wheel isi fixed, a pair of oppositely disposed eccentrics ixed on the shaft, an oscillatingsegnlental rack, ring-like yokes surroundino said eccentrics, jack lines connecting said yokes with said rack` and; disposed to oscillate the same as the eccentrics revolve, an oscillating member operatively connected to andv actuated by said rack, a pump ack andl an operative connection between said oscillating` member andv jack, whereby the latter is reciprocated from the former.

B. A devicevr or' the character described, includingA a power wheel', a. shaft on which said wheel is fixed, a pair of oppositely disposed eccentrics fixed on-k the shaft, an oscillating segmentall rack, ring-like yokes surrounding said eccentrics, jack lines connecting saidy yokes with said! rack andi disposed to oscilla-te the same as thefeccentrics revolve, means for adjustingv the connection of said@ jack lines to said: rack, an oscilla-ting member operatively connectedr to and actuated-1 bysaid: rack, a pump jack andi an operative. connection between said. oscillating member and jack, whereby the latter is reciprocated from. thel former.

In testimony whereof" l. have signed my name to this specificationin the presence of.' two subscribing.` witnesses. l

GEORGE A. STAFFORD.

Witnesses:

JAs. Wi OLIVER, WIM.` A. CATHEY. 

